I find my own annotations distracting when I’m rereading a book! I only annotate cheap paperbacks for uni and I’ve one or two novels I’ll eventually replace with unflagged/scribbled on copies because I just want to reread the stories.

Even professional annotations are sometimes annoying. Sometimes they’re really helpful but Ive come across a handful which spoil later parts of the book. Why?!

I've read books with non-standard punctuation for purely stylistic reasons and found that a bit annoying/pretentious. I read Hotel World by Ali Smith recently though and it abuses all sorts of punctuation and type-setting rules beautifully! It's done playfully, artfully and with purpose, so I loved it.